Siphon for decanting liquids



June 4, 1929. o. PETERS 1,715,470

-SIPHON FOR DECANTING LIQUIDS Filed Oct. 15, 1927 2 Sheets-Sheet l June 4, 1929. o. PETERS SIPHON FOR DEGANTING LIQUIDS 2 Sheets-Sheet 2 Filed Oct. 15, 1927 Patented June 4, 1,929. I

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OSCAR PETERsQoF onn vrnrrz, GERMANY.

srrnoiv ronnEcANrIne LIQUIDS.

Application filed October 15, 1927, serial No. 226,460, and. in Germany October 22,1926.

The invention relates to siphon decanters and has for its object to provide an improved device of this character.

I The object of the invention is to provide an automatic siphon decanter for all liquids, especially corrosive liquids, of the type 1n which an air-tight float valve is arranged between the suction device,'which may be the mouth, a suction ball, vacuum pump'and the like, and the siphon tube to be evacuated. 'According to the invention the suction device with float valve is mounted right at the head of thesiphon tube without inserting a three-way cock; By this means the result is obtained with certainty thatjthe float valve does not automatically seal the restricted passage of the float chamber until the siphon tubes are fully evacuated, i. e; filled with liquid.

7 If the evacuation of the siphon were effected from the outlet end or shortly in front of same instead of right at the head of the siphon, the siphon would only be capable of functioning with a tube of small cross-section. It is absolutely impossible for a liquid column, according to the consistency of the liq- I millimeters, normally to'run down as a closed uid, with a diameter of more than about '10 column. On thecontrary it runs down, ac-

' trates therefore prematurely into the suction cording to the law of cohesion, on the inner walls of the outlet pipe without expelling the air downward from the outlet pipe. It penedevice, lifts the float and thereby automaticall y' makes further suction impossible. If now such a siphon is opened in the outlet pipe it cannot function because'too much air is enclosed in the siphon. There, is no means of removing such air from a siphon.

Based upon the principle that the air, which is contained in the siphon tube and is to be removed, always collects in the upper part of the siphon only, it is necessary to mount the suction device right at the head of the siphon. Since the air is withdrawn I In the drawing the new siphoning device is shown in two alternative forms of construe tion for hand-ball and Vacuum pump operation.

Fig. 1 shows in section the construction and a 1 F 1g. 2 showing in section avacuum pump construction forlarge siphons.

decanted, the heador bend 1 and the outlet plpe 1 which continues to a point below the liquid level outside pipe 1 and closed at the with hand-ball operation for small siphons bottom bya cock. In the head 1 of the V siphon is a projection with opening 1 which screwed end of a sleeve 2. 5 is a float chamcemented to sleeve'2 by means of cement capable of resisting acid and/or alkali. Within a connection to the rubber ball 10 provided with valves lland 12. 8 is a protective cas- .-ing screwed on the sleeve 2 at the bottom and the cover 4; at the top.

\When the india-rubber ball 10 is pressed the air enclosed in it flows out through the valve 12, the valve 11 being then closed against downward flow. When the 'ballis released, a-reduction in pressure takes place. in it whereby the valve ll is opened and thevalve 12 closes. Air is'now sucked through the valve 11, theconnecting tube 9, the safety chamber 8 and the float chamber 5 from the siphon tube 1.. The operation of the-ball is repeated a few times until the liquid. rises in the'inlet branch 1 of the siphon','flows round the bendor head 1 passes the projection 1 and fills the outlet branch ,1 which is closed at'the bottomwith a cock. As soon as-the whole siphon tube i's-fillec'l, the liquid enters the, float chamber 5 and raises the float 7 the ground head 7 of which seats in the con-' striction 5 and thuseffects an air-tight seal."

This indicates that the siphon is filled with liquid and'the decanting operation can be commenced. Of course, it 1s .posslble in place of the valve llto provide a'valve at the entrance to the float chamber at the bottom or to grind the float 7 atthe bottom into its chamher with an opening at the bottom where-it isv is internally screw-threaded to receive the The safety chamber 8 is. provided in order to catch any drops of liquid pro ected upwards through'too strong suction so that the )cnetration ofeven the smallestquantity of liquid into the actual suction device istmade impossible.

floatflvalvc may, when thei'lo'at is made of glass, be provided with openings to permit the operation taking place in the float cham her to be seen. v V

vReflex-ringrte "Fig.2 the rubber ball 10 is replaced in this case by means of a small vacuum Jum havin a siston 15 ada ted to be reciprocated in a cylinder connected at one end through'a flexible pipe 13 to the siphon valie, a valve 11 mounted on a flap l l, being provided between the cylinder and the siphon valvc,and the other end vof the cylinder being provided with apertures 1? leading to the atmosphere. The cylinder is ,PLVOtGCl at one ,end toa fixed bracket and the piston rod 16 r connected to a crank arm 18 adapted to 1 be rotatedby means of an arm or handle 19.

Gn turning the handle 19, the piston is reciprocated in the, cylinder andfat each cutward stroke the valve 11 opens and valve 12 closes; at eachinward stroke the valve 11 closes and the valve 12 opens, Thus tne air is gradually evacuated trom the siphon pipes.

' The crank arm 19'can be operated by hand or by mechanical means.

Finally it may any continuous means of vacuum reduction. It does not matter how large the diameter vof the tube is orwhether the liquid in the vessel to be emptied stands at an extraordinary low level. In other words, it does not matter how'mu ch space filled with air has tobeevacuated in the siphon tube. The evacuating device arranged, at the head of the siphon can be continuously operated, no matter whether asmal] suction ball or a small suction pump is employed, until the tubes are completely evacuated and filled with liquid.

I claim r 1. A siphon for decanting liquids comprising the combination of a siphon pipe with upl'low and downflow branches, a branch passage at the head of said siphon pipe, a float chamber into which said branch passage opens, a constricted passage at the top o'f'said 'float chamber, a. splash catching chamber havinga "protected outlet and into which he jacket 3 provided for protection'ot the.

beobserved that with the v present invention 1t 1s poss ble-also to employ said constricted passage opens, a suction pump connected to said eonstr cted'passage and a float in said chamber having its upper 7 in the passage communicating with the to seat in said splash-catching chamber, a suction pumpvconnected to said splash catching chamber,

a piston in said suction pump'and means for operating said suction pump.

' 3. A siphon for do anting liquids'comprising the combination of a siphonpipe with upiiow and downflow branches, a branch-passage at the head of said siphon pipe, float chamber into which said branch passage opens, a constricted passage at the top of said float chamber, a splash-catching; chamber having a protected outlet and into which said constricted passage opens, a suction mechanism connected to said constricted passage, two valvesin the suction element, one between said suction element and the float casing, and the other controlling a connection to the'outside air, and a float insaid chamber having its-upper part plug shaped and adapted to seatin said constricted passage,

v 4. A siphon for decanting liquids comprising the combination of a siphon pipe with upflow and downflow branches, a short tubular projection at the head of said siphon between said upflow and downtlow branches,

a sleeve fitted to said tubular projection, a i

float chamber cemented to said sleeve and communicating at the bottom with said 'iphon head and at the top within a splashcatching chamber, a suction mechanism connected to said splashcatching chamber, two valves, secured inside of this suction element, one controlling the connection with the float chamber andthe other opening to the atmosphere. I V I In testimony whereof I have afiixed my nature, i a V OSCAR PETERS; 

